1. For DAO properties, use underscores. (These correspond to the DB schema - which uses underscores.)
2. For everything else, use camelCase. [See Forum Discussion](http://forum.civicrm.org/index.php/topic,35519.0.html)
**Rational for Change**
**Rationale for Change**
The codebase includes many examples of both "lowerCamelCase" and "snake_case" for function and variable names. Changing these can be quite difficult and can break interfaces consumed by downstream.
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@@ -95,7 +95,7 @@ Classes and interfaces in Civi take one of two forms:
* For the `CRM_` namespace, follow the PEAR convention (using underscores for pseudo-namespaces; e.g. `CRM_Foo_BarWhiz`).
* For the `Civi\` namespace, follow the PHP 5.3 convention (using backslashes for namespaces; e.g. `Civi\Foo\BarWhiz`).
**Rational for Change**
**Rationale for Change**
Changing these can be quite difficult and can break interfaces consumed by downstream. For more discussion of `CRM_` and `Civi\`, see [The Codebase](/framework/filesystem.md).
